[gdb/testsuite] Improve xfail in gdb.cp/nsusing.exp

In test-case gdb.cp/nsusing.exp I came across these xfails without PRMS
mentioned:
...
XFAIL: gdb.cp/nsusing.exp: print x, before using statement
XFAIL: gdb.cp/nsusing.exp: print x, only using M
...

Add the missing PRMS, such that we have:
...
XFAIL: gdb.cp/nsusing.exp: print x, before using statement (PRMS gcc/108716)
XFAIL: gdb.cp/nsusing.exp: print x, only using M (PRMS gcc/108716)
...
and limit the xfail to unfixed versions.

The PR is fixed starting gcc 13, but it has been backported to release
branches stretching back to gcc 10.  For simplicity we just stick to testing
for the major version and ignore the backported fixes.

Tested on x86_64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/gdb/testsuite/gdb.cp/nsusing.exp b/gdb/testsuite/gdb.cp/nsusing.exp
index f34910b..d44e389 100644
--- a/gdb/testsuite/gdb.cp/nsusing.exp
+++ b/gdb/testsuite/gdb.cp/nsusing.exp
@@ -122,14 +122,23 @@ if { [test_compiler_info {gcc-[0-3]-*}] ||
     return
 }
 
+# Xfail for incorrect decl_line on DW_TAG_imported_module,
+# gcc PR debug/108716.
+set have_gcc108716_xfail \
+    [expr [test_compiler_info gcc-*] && [gcc_major_version] < 13]
+
 gdb_test_multiple "print x" "print x, before using statement" {
     -re -wrap "No symbol .x. in current context.*" {
 	pass $gdb_test_name
     }
     -re -wrap "Reference to .x. is ambiguous.*" {
-	# GCC doesn't properly set the decl_line for namespaces, so GDB believes
-	# that the "using namespace M" line has already passed at this point.
-	xfail $gdb_test_name
+	if { $have_gcc108716_xfail } {
+	    # GCC doesn't properly set the decl_line for namespaces, so GDB
+	    # believes that the "using namespace M" line has already passed at
+	    # this point.
+	    setup_xfail *-*-* gcc/108716
+	}
+	fail $gdb_test_name
     }
 }
 gdb_test "next" ".*" "using namespace M"
@@ -138,7 +147,10 @@ gdb_test_multiple "print x" "print x, only using M" {
 	pass $gdb_test_name
     }
     -re -wrap "Reference to .x. is ambiguous.*" {
-	xfail $gdb_test_name
+	if { $have_gcc108716_xfail } {
+	    setup_xfail *-*-* gcc/108716
+	}
+	fail $gdb_test_name
     }
 }
 gdb_test "next" ".*" "using namespace N"